You are using uint32(Maximum 4Gb) to store needle offset(Maximum 32Gb) when compacting. Currently It is ok if the volume size is < 4gb Change variable "offset" in ScanVolumeFile function to uint64 to fix the issue.

This is by design. There is a up-to-8-bytes padding to use uint32 to represent 32GB offset.

Yes, I know that. You are using uint32(* 8 bytes padding = 32Gb maximum) to represent the needle offset in memory. When compacting, you read needles from dat file, the "offset" variable in ScanVolumeFile function is not divided by 8 --> so it should be uint64 not uint32

Please read the code carefully

Read the code carefully or you can test by Println offset in ScanVolumeFile function when compacting volume(size > 4gb) :)

Thanks for your detailed suggestions! Fix now is in v0.42